I like the medal! I prefer the Disney marathon medals with the more prominent Mickey ears that stick out off the top, and this medal doesn't have them. But I still like this design!!
This is probably not news to anyone, in fact perhaps this blogger is on the DIS too, but here is a (not quite complete) history of the medals:
http://justkeepgoofin.blogspot.com/2010/09/history-of-mickey-medal.html
Funny, I didn't remember that my first WDW marathon was the 10 year anniversary. Now I'm doing the 20th. Time flies.